JS 判断浏览器客户端类型(ipad,iphone,android)

<script type="text/javascript"> 

var bForcepc = fGetQuery("dv") == "pc"; 

function fBrowserRedirect(){ 

    var sUserAgent = navigator.userAgent.toLowerCase(); 

    var bIsIpad = sUserAgent.match(/ipad/i) == "ipad";   

    var bIsIphoneOs = sUserAgent.match(/iphone os/i) == "iphone os"; 

    var bIsMidp = sUserAgent.match(/midp/i) == "midp"; 

    var bIsUc7 = sUserAgent.match(/rv:1.2.3.4/i) == "rv:1.2.3.4"; 

    var bIsUc = sUserAgent.match(/ucweb/i) == "ucweb"; 

    var bIsAndroid = sUserAgent.match(/android/i) == "android"; 

    var bIsCE = sUserAgent.match(/windows ce/i) == "windows ce"; 

    var bIsWM = sUserAgent.match(/windows mobile/i) == "windows mobile"; 

    if(bIsIpad){ 

        var sUrl = location.href;     

        if(!bForcepc){ 

            window.location.href = "http://ipad.mail.163.com/"; 

        } 

    } 

    if(bIsIphoneOs || bIsAndroid){ 

        var sUrl = location.href;     

        if(!bForcepc){ 

            window.location.href = "http://smart.mail.163.com/"; 

        } 

    } 

    if(bIsMidp||bIsUc7||bIsUc||bIsCE||bIsWM){ 

        var sUrl = location.href;     

        if(!bForcepc){ 

            window.location.href = "http://m.mail.163.com/"; 

        } 

    } 

} 

function fGetQuery(name){//获取参数值 

    var sUrl = window.location.search.substr(1); 

    var r = sUrl.match(new RegExp("(^|&)" + name + "=([^&]*)(&|$)")); 

    return (r == null ? null : unescape(r[2])); 

} 

function fShowVerBlock(){    

    if(bForcepc){ 

        document.getElementById("dv_block").style.display = "block"; 

    } 

    else{ 

        document.getElementById("ad_block").style.display = "block"; 

    } 

} 

fBrowserRedirect(); 

</script>